Air-flow problems....

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Wogster

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To get to the problem right away... I currently have 2 fans in my CPU, 1 on the plastic side panel that blows in cool air, and 1 at the back that sends the hot air out. I'm planning on putting one\or two fans at the horizontal top of the case. The fan on the side of the case right now is very new and very strong, it is also got a wirling noise that's driving me batty.
With the (lets say... two fans) at the top of the case... what's the best air-flow direction to have...?

Oh and by-the-way, my case sits under the desk in and open cradle... there's approximately 2-1/2 inches clearance to the under of the desk.

Should the 2 fans (side and back) blow in, and the 2 at the top blow hot air out or the other way around ?

Please help. Is a fan blowing in the case noisier then blowing out?

Wogster.
 
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This is the recommended way of setting up fans. My machine is set up exactly this way other than I have an intake fan instead of just vents.

There are many other ways to set up airflow but this one is the most simple.
 

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Wogster

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I don't have the option of a front fan, or a vent. I would if I could, but can not!!! I think that's why they put the fan in the side pannel....
 

Wogster

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If I put the 2 at the top blowing fresh air in...that would give the power supply fresh air, as well as the processor, the side and back fans could blow hot air out of the case..... a hard drive fan could later be put in if needed.

Wogster.
 
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As long as it is low and to the front it is fine. Is it hooked to a fan header on the motherboard or just plugged into the power supply?

If it is on a fan header you can control the speed with speedfan. If it isn't you'd need a fan controller to quiet it down.
 
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Top fans should exhaust for the simple reason heat rises. You'd be pushing heat back down into the case.
 

Wogster

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The fan on the side panel (the noisey one) is connected to the MB, what is Speedfan and how do I get it? I was thinking about a fan contyroller once the top 2 fans are in.
 

Wogster

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Do they have automated (digital) fan controllers, I don't know that much about them, but have heard of them recently. So the two at the top blow hot-air out, sounds logical.
 
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Wogster said:
I don't have the option of a front fan, or a vent. I would if I could, but can not!!! I think that's why they put the fan in the side pannel....
Here's how I cool my prescott. I replaced the original window with one I had bought and cut to size at Home Depot. :eek:
 

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Skivvywaver said:
This is the recommended way of setting up fans. My machine is set up exactly this way other than I have an intake fan instead of just vents.

There are many other ways to set up airflow but this one is the most simple.
Hey Skivvywaver, I have seen that illustration before but if you don't have you cabling tied up it seems that the cables would so break up the airflow as to nullify it.
 

Wogster

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Wow... that's one big fan you've got on the side of your case... what size is that? I've never seen one that big. You also have a rear case fan. What direction do your fans go to move the air? all my cables are not wrapped just yet until I do all the runs that I need with the fans the the controller... I know it's a must for proper air-flow. I will get photo's of my case for you to see it soon....

Wogster.
 
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I believe a side panel fan works better blowing outward instead of inward, unless you have ducting to the heatsink. We had a case at work that didn't have a place for a front vent, so I took my dremel and cut a portion out of the bottom of the front bezel underneath the case so that it would have a place for airflow.

As far as the noise from the side fan, I'd advise you to put a fan controller on it so that you can vary it's speed. Also, a lot of people don't consider the power supply when regarding airflow in the case. A good power supply with either dual fans or a oversized 120mm fan makes alot of difference in case temps.

If the reason your questioning the airflow in the case is cpu temps, then you might want to change the heatsink instead of casefans. Most people look at case fans first, but if the case has reasonable airflow, a quality heatsink applied correctly will normally make more difference in cpu temps.
 
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Wogster said:
Wow... that's one big fan you've got on the side of your case... what size is that? I've never seen one that big. You also have a rear case fan. What direction do your fans go to move the air? all my cables are not wrapped just yet until I do all the runs that I need with the fans the the controller... I know it's a must for proper air-flow. I will get photo's of my case for you to see it soon....

Wogster.
That's a 120mm intake over the CPU and a 120mm exhaust out the back. They are both Antec Quiet fans
 
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